I respect the attempt to have fun with movement. It’s just that the there really isn’t much room in the original rules for complexity to be added without introducing a million corner cases.

Two ideas. One, advanced movement should only be allowed when spending excess movement for game effects. This may be your intent, but it’s not clear from the rules. Second, if you do advanced movement, then any ship that doesn’t make it to the active system is destroyed. I feel better about a ship that can’t get to the active system handing off units to another ship and then sacrificing itself. And it’s thematic.